Stirring of a planetesimal swarm - The role of distant encounters

Details Stirring of a planetesimal swarm - The role of distant encounters Stirring of a planetesimal swarm - The role of distant encounters

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989icar...80..179w&link_type=abstract

Icarus (ISSN 0019-1035), vol. 80, July 1989, p. 179-188.

Computer Science

29

Planetary Evolution, Protoplanets, Three Body Problem, Gravitational Effects, Orbit Perturbation, Planetary Mass, Planetesimals, Gravity Effects, Perturbations, Orbital Elements, Orbits, Eccentricity, Inclination, Distance, Calculations, Parameters

Scientific paper

The viscous stirring algorithm developed by Stewart and Wetherill (1988) to treat the random velocities induced in planetesimals by their mutual gravitational perturbations encompasses only the scattering of bodies in crossing orbits by close encounters. Expressions are presently derived for the stirring rate due to distant encounters on the basis of three-body formalism, using a stirring rate that has the same mass-dependence as that for close encounters. The relative importance of both the close encounter and distant encounter mechanisms depends on the Safronov number. Perturbations by a planetary embryo in scenarios that involve explosive growth are found capable of affecting planetesimal evolution in noncrossing orbits.

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